While a material is changing state:
a. its temperature is constantly changing.
b. its temperature stays constant.
c. its atomic and molecular motions become less limited.
d. its internal (thermal) energy stays constant.
e. the amount of heat needed is given by its specific heat.
b
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Two kg of water are heated from 15ºC to 300ºC at 101 kPa. Determine the amount of heat added during the process. Assume cP is 4.18 kJ/kg·K for liquid water and 1.86 kJ/kg·K for steam. Assume the heat of vaporization is 2258 kJ/kg at 101 kPa.
What will be an ideal response?
You throw a baseball straight up. Compare the sign of the work done by the gravitational force exerted by Earth on the object while the ball goes up with the sign of the work done by the same force while it goes down
A) The work is positive on the way up and positive on the way down. B) The work is positive on the way up and negative on the way down. C) The work is negative on the way up and positive on the way down. D) The work is negative on the way up and on the way down because gravity is always downward.
A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
and if it can do work at a rate of 1250 W, what is the rate of heat flow into the house?
A. 340 W B. 1100 W C. 625 W D. 300 W
A planet has two identical moons with identical mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r. The magnitude of the gravitational force exerted by the planet on Moon 2 is
1.four times as large as the gravitational force exerted by the planet on Moon 1. 2.twice as large as the gravitational force exerted by the planet on Moon 1. 3.the same as the gravitational force exerted by the planet on Moon 1. 4.half as large as the gravitational force exerted by the planet on Moon 1. 5.one-fourth as large as the gravitational force exerted by the planet on Moon 1.